I have completed everything, and i have done all the potions to "make babies"...the fertiles, romantic, embrace.. what am i doing wrong?. does a villager need to be something in specific? who will give me triplets?

I think it requires luck...

Be patient.

In my experience (in all three games) it has always been random....it could be a master parent, or someone who's got no skill at all.

You're just making babies then one mother pops out of the door with three of them! (or two )

So just keep at it and you'll get some eventually!

I also remember reading on a forum that if someone is a triplet they're more likely to have triplets, I've never tried this though.